BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
Having rescued Rebel strategist Jorin Sol from the Empire, Luke Skywalker now leads X-Wing attack runs on Imperial convoys to rustle up much needed supplies for the Rebel fleet. Little does he know that within Sol lies a secret that will put the entire Alliance in danger. What's worse, when Luke receives a coded message from Lt. Sunber, he must decide whether to trust his old friend or obey the orders of Princess Leia who believes Tank may be part of an Imperial plot to capture the Rebellion's greatest hero!